It may be the time zone of the countries.
For example, if you are targeting other country and scheduling the time between 6 pm to 10 pm. The ad starts to appear only when the time of that country is 6 pm.
If it is not the issue
contact the team
facebook.com/business/resourcesThere is no way to contact them, I have searched everywhere!
facebook.com/business/resources
Chat with them they can solve your problem
Try a new campaign thenthis is the campaign I set up previously, there is no schedule it runs all day every day
Try a new campaign then
Waiting for your update matethanks, just done, waiting for review
Waiting for your update mate![]()